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prev_mode: rm_cur/rm_prev

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This commit is contained in:
folkert van heusden 2023-03-25 13:57:47 +01:00
parent ebbc11993b
commit d66650b5b2
Signed by untrusted user who does not match committer: folkert
GPG key ID: 6B6455EDFEED3BD1
5 changed files with 107 additions and 105 deletions
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14
bus.cpp
View file

@ -114,7 +114,7 @@ void bus::trap_odd(const uint16_t a)
c->trap(004); // invalid access
}
uint16_t bus::read(const uint16_t a, const word_mode_t word_mode, const bool use_prev, const bool peek_only, const d_i_space_t space)
uint16_t bus::read(const uint16_t a, const word_mode_t word_mode, const rm_selection_t mode_selection, const bool peek_only, const d_i_space_t space)
{
uint16_t temp = 0;
@ -394,7 +394,7 @@ uint16_t bus::read(const uint16_t a, const word_mode_t word_mode, const bool use
return 0;
}
int run_mode = (c->getPSW() >> (use_prev ? 12 : 14)) & 3;
int run_mode = (c->getPSW() >> (mode_selection == rm_prev ? 12 : 14)) & 3;
uint32_t m_offset = calculate_physical_address(run_mode, a, !peek_only, false, peek_only, space);
@ -683,9 +683,9 @@ void bus::write_par(const uint32_t a, const int run_mode, const uint16_t value,
DOLOG(debug, true, "WRITE-I/O PAR run-mode %d: %c for %d: %o (%07o)", run_mode, is_d ? 'D' : 'I', page, word_mode ? value & 0xff : value, pages[run_mode][is_d][page].par * 64);
}
void bus::write(const uint16_t a, const word_mode_t word_mode, uint16_t value, const bool use_prev, const d_i_space_t space)
void bus::write(const uint16_t a, const word_mode_t word_mode, uint16_t value, const rm_selection_t mode_selection, const d_i_space_t space)
{
int run_mode = (c->getPSW() >> (use_prev ? 12 : 14)) & 3;
int run_mode = (c->getPSW() >> (mode_selection == rm_prev ? 12 : 14)) & 3;
if ((MMR0 & 1) == 1 && (a & 1) == 0 && a != ADDR_MMR0) {
const uint8_t apf = a >> 13; // active page field
@ -993,17 +993,17 @@ uint16_t bus::readPhysical(const uint32_t a)
uint16_t bus::readWord(const uint16_t a, const d_i_space_t s)
{
return read(a, wm_word, false, false, s);
return read(a, wm_word, rm_cur, false, s);
}
uint16_t bus::peekWord(const uint16_t a)
{
return read(a, wm_word, false, true);
return read(a, wm_word, rm_cur, true);
}
void bus::writeWord(const uint16_t a, const uint16_t value, const d_i_space_t s)
{
write(a, wm_word, value, false, s);
write(a, wm_word, value, rm_cur, s);
}
uint16_t bus::readUnibusByte(const uint16_t a)

10
bus.h
View file

@ -62,6 +62,8 @@ typedef enum { d_space, i_space } d_i_space_t;
typedef enum { wm_word = 0, wm_byte = 1 } word_mode_t;
typedef enum { rm_prev, rm_cur } rm_selection_t;
typedef struct {
uint16_t virtual_address;
uint8_t apf; // active page field
@ -129,15 +131,15 @@ public:
void set_lf_crs_b7();
uint8_t get_lf_crs();
uint16_t read(const uint16_t a, const word_mode_t word_mode, const bool use_prev, const bool peek_only=false, const d_i_space_t s = i_space);
uint16_t readByte(const uint16_t a) { return read(a, wm_byte, false); }
uint16_t read(const uint16_t a, const word_mode_t word_mode, const rm_selection_t mode_selection, const bool peek_only=false, const d_i_space_t s = i_space);
uint16_t readByte(const uint16_t a) { return read(a, wm_byte, rm_cur); }
uint16_t readWord(const uint16_t a, const d_i_space_t s = i_space);
uint16_t peekWord(const uint16_t a);
uint16_t readUnibusByte(const uint16_t a);
void write(const uint16_t a, const word_mode_t word_mode, uint16_t value, const bool use_prev, const d_i_space_t s = i_space);
void writeByte(const uint16_t a, const uint8_t value) { return write(a, wm_byte, value, false); }
void write(const uint16_t a, const word_mode_t word_mode, uint16_t value, const rm_selection_t mode_selection, const d_i_space_t s = i_space);
void writeByte(const uint16_t a, const uint8_t value) { return write(a, wm_byte, value, rm_cur); }
void writeWord(const uint16_t a, const uint16_t value, const d_i_space_t s = i_space);
uint16_t readPhysical(const uint32_t a);

170
cpu.cpp
View file

@ -93,7 +93,7 @@ void cpu::reset()
init_interrupt_queue();
}
uint16_t cpu::getRegister(const int nr, const bool sp_prev_mode) const
uint16_t cpu::getRegister(const int nr, const rm_selection_t mode_selection) const
{
if (nr < 6) {
int set = getBitPSW(11);
@ -102,7 +102,7 @@ uint16_t cpu::getRegister(const int nr, const bool sp_prev_mode) const
}
if (nr == 6) {
if (sp_prev_mode)
if (mode_selection == rm_prev)
return sp[(getPSW() >> 12) & 3];
return sp[getPSW() >> 14];
@ -111,7 +111,7 @@ uint16_t cpu::getRegister(const int nr, const bool sp_prev_mode) const
return pc;
}
void cpu::setRegister(const int nr, const uint16_t value, const bool prev_mode)
void cpu::setRegister(const int nr, const uint16_t value, const rm_selection_t mode_selection)
{
if (nr < 6) {
int set = getBitPSW(11);
@ -119,7 +119,7 @@ void cpu::setRegister(const int nr, const uint16_t value, const bool prev_mode)
regs0_5[set][nr] = value;
}
else if (nr == 6) {
if (prev_mode)
if (mode_selection == rm_prev)
sp[(getPSW() >> 12) & 3] = value;
else
sp[getPSW() >> 14] = value;
@ -129,7 +129,7 @@ void cpu::setRegister(const int nr, const uint16_t value, const bool prev_mode)
}
}
void cpu::setRegisterLowByte(const int nr, const word_mode_t word_mode, const uint16_t value) // prev_mode == false
void cpu::setRegisterLowByte(const int nr, const word_mode_t word_mode, const uint16_t value)
{
if (word_mode == wm_byte) {
uint16_t v = getRegister(nr);
@ -154,18 +154,18 @@ bool cpu::put_result(const gam_rc_t & g, const uint16_t value)
return true;
}
b->write(g.addr.value(), g.word_mode, value, false);
b->write(g.addr.value(), g.word_mode, value, rm_cur);
return g.addr.value() != ADDR_PSW;
}
uint16_t cpu::addRegister(const int nr, const bool prev_mode, const uint16_t value)
uint16_t cpu::addRegister(const int nr, const rm_selection_t mode_selection, const uint16_t value)
{
if (nr < 6)
return regs0_5[getBitPSW(11)][nr] += value;
if (nr == 6) {
if (prev_mode)
if (mode_selection == rm_prev)
return sp[(getPSW() >> 12) & 3] += value;
return sp[getPSW() >> 14] += value;
@ -311,9 +311,9 @@ void cpu::addToMMR1(const uint8_t mode, const uint8_t reg, const word_mode_t wor
}
// GAM = general addressing modes
gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const word_mode_t word_mode, const bool prev_mode, const bool read_value)
gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const word_mode_t word_mode, const rm_selection_t mode_selection, const bool read_value)
{
gam_rc_t g { word_mode, prev_mode, i_space, { }, { }, { } };
gam_rc_t g { word_mode, mode_selection, i_space, { }, { }, { } };
d_i_space_t isR7_space = reg == 7 ? i_space : (b->get_use_data_space(psw >> 14) ? d_space : i_space);
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ always d_space here? TODO
@ -325,61 +325,61 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const word_mode_t wo
switch(mode) {
case 0: // Rn
g.reg = reg;
g.value = getRegister(reg, prev_mode) & (word_mode == wm_byte ? 0xff : 0xffff);
g.value = getRegister(reg, mode_selection) & (word_mode == wm_byte ? 0xff : 0xffff);
break;
case 1: // (Rn)
g.addr = getRegister(reg, prev_mode);
g.addr = getRegister(reg, mode_selection);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, isR7_space);
g.value = b->read(g.addr.value(), word_mode, mode_selection, false, isR7_space);
break;
case 2: // (Rn)+ / #n
g.addr = getRegister(reg, prev_mode);
g.addr = getRegister(reg, mode_selection);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, isR7_space);
addRegister(reg, prev_mode, word_mode == wm_word || reg == 7 || reg == 6 ? 2 : 1);
g.value = b->read(g.addr.value(), word_mode, mode_selection, false, isR7_space);
addRegister(reg, mode_selection, word_mode == wm_word || reg == 7 || reg == 6 ? 2 : 1);
addToMMR1(mode, reg, word_mode);
break;
case 3: // @(Rn)+ / @#a
g.addr = b->read(getRegister(reg, prev_mode), wm_word, prev_mode, false, isR7_space);
addRegister(reg, prev_mode, 2);
g.addr = b->read(getRegister(reg, mode_selection), wm_word, mode_selection, false, isR7_space);
addRegister(reg, mode_selection, 2);
if (read_value) {
g.space = d_space;
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, g.space);
g.value = b->read(g.addr.value(), word_mode, mode_selection, false, g.space);
}
addToMMR1(mode, reg, word_mode);
break;
case 4: // -(Rn)
addRegister(reg, prev_mode, word_mode == wm_word || reg == 7 || reg == 6 ? -2 : -1);
g.addr = getRegister(reg, prev_mode);
addRegister(reg, mode_selection, word_mode == wm_word || reg == 7 || reg == 6 ? -2 : -1);
g.addr = getRegister(reg, mode_selection);
if (read_value)
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, isR7_space);
g.value = b->read(g.addr.value(), word_mode, mode_selection, false, isR7_space);
addToMMR1(mode, reg, word_mode);
break;
case 5: // @-(Rn)
addRegister(reg, prev_mode, -2);
g.addr = b->read(getRegister(reg, prev_mode), wm_word, prev_mode, false, isR7_space);
addRegister(reg, mode_selection, -2);
g.addr = b->read(getRegister(reg, mode_selection), wm_word, mode_selection, false, isR7_space);
if (read_value) {
g.space = d_space;
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, g.space);
g.value = b->read(g.addr.value(), word_mode, mode_selection, false, g.space);
}
addToMMR1(mode, reg, word_mode);
break;
case 6: // x(Rn) / a
next_word = b->read(getPC(), wm_word, prev_mode, false, i_space);
addRegister(7, prev_mode, + 2);
g.addr = getRegister(reg, prev_mode) + next_word;
next_word = b->read(getPC(), wm_word, mode_selection, false, i_space);
addRegister(7, mode_selection, + 2);
g.addr = getRegister(reg, mode_selection) + next_word;
if (read_value) {
g.space = d_space;
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, g.space);
g.value = b->read(g.addr.value(), word_mode, mode_selection, false, g.space);
}
break;
case 7: // @x(Rn) / @a
next_word = b->read(getPC(), wm_word, prev_mode, false, i_space);
addRegister(7, prev_mode, + 2);
g.addr = b->read(getRegister(reg, prev_mode) + next_word, wm_word, prev_mode, false, d_space);
next_word = b->read(getPC(), wm_word, mode_selection, false, i_space);
addRegister(7, mode_selection, + 2);
g.addr = b->read(getRegister(reg, mode_selection) + next_word, wm_word, mode_selection, false, d_space);
if (read_value) {
g.space = d_space;
g.value = b->read(g.addr.value(), word_mode, prev_mode, false, g.space);
g.value = b->read(g.addr.value(), word_mode, mode_selection, false, g.space);
}
break;
}
@ -390,19 +390,19 @@ gam_rc_t cpu::getGAM(const uint8_t mode, const uint8_t reg, const word_mode_t wo
bool cpu::putGAM(const gam_rc_t & g, const uint16_t value)
{
if (g.addr.has_value()) {
b->write(g.addr.value(), g.word_mode, value, g.prev_mode, g.space);
b->write(g.addr.value(), g.word_mode, value, g.mode_selection, g.space);
return g.addr.value() != ADDR_PSW;
}
setRegister(g.reg.value(), value, g.prev_mode);
setRegister(g.reg.value(), value, g.mode_selection);
return true;
}
gam_rc_t cpu::getGAMAddress(const uint8_t mode, const int reg, const word_mode_t word_mode)
{
return getGAM(mode, reg, word_mode, false, false);
return getGAM(mode, reg, word_mode, rm_cur, false);
}
bool cpu::double_operand_instructions(const uint16_t instr)
@ -425,10 +425,10 @@ bool cpu::double_operand_instructions(const uint16_t instr)
const uint8_t src_mode = (src >> 3) & 7;
const uint8_t src_reg = src & 7;
gam_rc_t g_src { wm_word, false, i_space, { }, { }, { } };
gam_rc_t g_src { wm_word, rm_cur, i_space, { }, { }, { } };
if (operation != 0b110)
g_src = getGAM(src_mode, src_reg, word_mode, false);
g_src = getGAM(src_mode, src_reg, word_mode, rm_cur);
const uint8_t dst = instr & 63;
const uint8_t dst_mode = (dst >> 3) & 7;
@ -441,7 +441,7 @@ bool cpu::double_operand_instructions(const uint16_t instr)
if (word_mode == wm_byte && dst_mode == 0)
setRegister(dst_reg, int8_t(g_src.value.value())); // int8_t: sign extension
else {
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, false, false);
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, rm_cur, false);
set_flags = putGAM(g_dst, g_src.value.value());
}
@ -453,7 +453,7 @@ bool cpu::double_operand_instructions(const uint16_t instr)
}
case 0b010: { // CMP/CMPB Compare Word/Byte
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, false);
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t temp = (g_src.value.value() - g_dst.value.value()) & (word_mode == wm_byte ? 0xff : 0xffff);
@ -466,7 +466,7 @@ bool cpu::double_operand_instructions(const uint16_t instr)
}
case 0b011: { // BIT/BITB Bit Test Word/Byte
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, false);
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t result = (g_dst.value.value() & g_src.value.value()) & (word_mode == wm_byte ? 0xff : 0xffff);
setPSW_flags_nzv(result, word_mode);
@ -475,7 +475,7 @@ bool cpu::double_operand_instructions(const uint16_t instr)
}
case 0b100: { // BIC/BICB Bit Clear Word/Byte
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, false);
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t result = g_dst.value.value() & ~g_src.value.value();
@ -486,7 +486,7 @@ bool cpu::double_operand_instructions(const uint16_t instr)
}
case 0b101: { // BIS/BISB Bit Set Word/Byte
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, false);
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t result = g_dst.value.value() | g_src.value.value();
@ -500,9 +500,9 @@ bool cpu::double_operand_instructions(const uint16_t instr)
}
case 0b110: { // ADD/SUB Add/Subtract Word
auto g_ssrc = getGAM(src_mode, src_reg, wm_word, false);
auto g_ssrc = getGAM(src_mode, src_reg, wm_word, rm_cur);
auto g_dst = getGAM(dst_mode, dst_reg, wm_word, false);
auto g_dst = getGAM(dst_mode, dst_reg, wm_word, rm_cur);
int16_t result = 0;
@ -555,7 +555,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
case 0: { // MUL
int16_t R1 = getRegister(reg);
auto R2g = getGAM(dst_mode, dst_reg, wm_word, false);
auto R2g = getGAM(dst_mode, dst_reg, wm_word, rm_cur);
int16_t R2 = R2g.value.value();
int32_t result = R1 * R2;
@ -571,7 +571,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
}
case 1: { // DIV
auto R2g = getGAM(dst_mode, dst_reg, wm_word, false);
auto R2g = getGAM(dst_mode, dst_reg, wm_word, rm_cur);
int16_t divider = R2g.value.value();
if (divider == 0) { // divide by zero
@ -611,7 +611,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
case 2: { // ASH
uint32_t R = getRegister(reg), oldR = R;
auto g_dst = getGAM(dst_mode, dst_reg, wm_word, false);
auto g_dst = getGAM(dst_mode, dst_reg, wm_word, rm_cur);
uint16_t shift = g_dst.value.value() & 077;
bool sign = SIGN(R, wm_word);
@ -664,7 +664,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
case 3: { // ASHC
uint32_t R0R1 = (getRegister(reg) << 16) | getRegister(reg | 1);
auto g_dst = getGAM(dst_mode, dst_reg, wm_word, false);
auto g_dst = getGAM(dst_mode, dst_reg, wm_word, rm_cur);
uint16_t shift = g_dst.value.value() & 077;
bool sign = R0R1 & 0x80000000;
@ -720,7 +720,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
case 4: { // XOR (word only)
uint16_t reg_v = getRegister(reg); // in case it is R7
auto g_dst = getGAM(dst_mode, dst_reg, wm_word, false);
auto g_dst = getGAM(dst_mode, dst_reg, wm_word, rm_cur);
uint16_t vl = g_dst.value.value() ^ reg_v;
bool set_flags = putGAM(g_dst, vl);
@ -732,7 +732,7 @@ bool cpu::additional_double_operand_instructions(const uint16_t instr)
}
case 7: { // SOB
addRegister(reg, false, -1);
addRegister(reg, rm_cur, -1);
if (getRegister(reg)) {
uint16_t newPC = getPC() - dst * 2;
@ -761,7 +761,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
if (word_mode == wm_byte) // handled elsewhere
return false;
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, false);
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t v = g_dst.value.value();
@ -781,14 +781,14 @@ bool cpu::single_operand_instructions(const uint16_t instr)
bool set_flags = false;
if (word_mode == wm_byte && dst_mode == 0) {
auto g_dst = getGAM(dst_mode, dst_reg, wm_byte, false);
auto g_dst = getGAM(dst_mode, dst_reg, wm_byte, rm_cur);
uint16_t r = g_dst.value.value() & 0xff00;
set_flags = putGAM(g_dst, r);
}
else {
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, false, false);
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, rm_cur, false);
set_flags = putGAM(g_dst, 0);
}
@ -804,7 +804,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
}
case 0b000101001: { // COM/COMB
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t v = a.value.value();
if (word_mode == wm_byte)
@ -823,7 +823,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
}
case 0b000101010: { // INC/INCB
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
if (dst_mode == 0) {
uint16_t v = a.value.value();
@ -849,7 +849,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setPSW_v(word_mode == wm_byte ? vl == 0x80 : vl == 0x8000);
}
b->write(a.addr.value(), word_mode, vl, false);
b->write(a.addr.value(), word_mode, vl, rm_cur);
}
break;
@ -871,7 +871,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setRegister(dst_reg, v);
}
else {
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t v = a.value.value();
int32_t vl = (v - 1) & (word_mode == wm_byte ? 0xff : 0xffff);
@ -883,7 +883,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setPSW_v(word_mode == wm_byte ? vl == 0x7f : vl == 0x7fff);
}
b->write(a.addr.value(), word_mode, vl, false);
b->write(a.addr.value(), word_mode, vl, rm_cur);
}
break;
@ -905,10 +905,10 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setRegister(dst_reg, v);
}
else {
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t v = -a.value.value();
b->write(a.addr.value(), word_mode, v, false);
b->write(a.addr.value(), word_mode, v, rm_cur);
bool set_flags = a.addr.value() != ADDR_PSW;
@ -941,12 +941,12 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setRegister(dst_reg, v);
}
else {
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
const uint16_t vo = a.value.value();
bool org_c = getPSW_c();
uint16_t v = (vo + org_c) & (word_mode == wm_byte ? 0x00ff : 0xffff);
b->write(a.addr.value(), word_mode, v, false);
b->write(a.addr.value(), word_mode, v, rm_cur);
bool set_flags = a.addr.value() != ADDR_PSW;
@ -983,12 +983,12 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setRegister(dst_reg, v);
}
else {
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
const uint16_t vo = a.value.value();
bool org_c = getPSW_c();
uint16_t v = (vo - org_c) & (word_mode == wm_byte ? 0xff : 0xffff);
b->write(a.addr.value(), word_mode, v, false);
b->write(a.addr.value(), word_mode, v, rm_cur);
bool set_flags = a.addr.value() != ADDR_PSW;
@ -1007,7 +1007,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
}
case 0b000101111: { // TST/TSTB
uint16_t v = getGAM(dst_mode, dst_reg, word_mode, false).value.value();
uint16_t v = getGAM(dst_mode, dst_reg, word_mode, rm_cur).value.value();
setPSW_flags_nzv(v, word_mode);
setPSW_c(false);
@ -1038,7 +1038,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setPSW_v(getPSW_c() ^ getPSW_n());
}
else {
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t t = a.value.value();
bool new_carry = t & 1;
@ -1048,7 +1048,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
else
temp = (t >> 1) | (getPSW_c() << 15);
b->write(a.addr.value(), word_mode, temp, false);
b->write(a.addr.value(), word_mode, temp, rm_cur);
bool set_flags = a.addr.value() != ADDR_PSW;
@ -1085,7 +1085,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setPSW_v(getPSW_c() ^ getPSW_n());
}
else {
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t t = a.value.value();
bool new_carry = false;
@ -1099,7 +1099,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
temp = (t << 1) | getPSW_c();
}
b->write(a.addr.value(), word_mode, temp, false);
b->write(a.addr.value(), word_mode, temp, rm_cur);
bool set_flags = a.addr.value() != ADDR_PSW;
@ -1140,7 +1140,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setPSW_v(getPSW_n() ^ getPSW_c());
}
else {
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t v = a.value.value();
uint16_t add = word_mode == wm_byte ? v & 0xff00 : 0; // TODO is this right?
@ -1158,7 +1158,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
v |= hb << 15;
}
b->write(a.addr.value(), word_mode, v, false);
b->write(a.addr.value(), word_mode, v, rm_cur);
bool set_flags = a.addr.value() != ADDR_PSW;
@ -1188,7 +1188,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
}
else {
auto a = getGAM(dst_mode, dst_reg, word_mode, false);
auto a = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t vl = a.value.value();
uint16_t v = (vl << 1) & (word_mode == wm_byte ? 0xff : 0xffff);
@ -1201,7 +1201,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
setPSW_v(getPSW_n() ^ getPSW_c());
}
b->write(a.addr.value(), word_mode, v, false);
b->write(a.addr.value(), word_mode, v, rm_cur);
}
break;
}
@ -1213,7 +1213,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
uint16_t v = 0xffff;
if (dst_mode == 0)
v = getRegister(dst_reg, true);
v = getRegister(dst_reg, rm_prev);
else {
// calculate address in current address space
auto a = getGAMAddress(dst_mode, dst_reg, wm_word);
@ -1222,7 +1222,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
if (a.addr.value() >= 0160000) {
// read from previous space
v = b->read(a.addr.value(), wm_word, true);
v = b->read(a.addr.value(), wm_word, rm_prev);
}
else {
int run_mode = (getPSW() >> 12) & 3;
@ -1256,14 +1256,14 @@ bool cpu::single_operand_instructions(const uint16_t instr)
bool set_flags = true;
if (dst_mode == 0)
setRegister(dst_reg, v, true);
setRegister(dst_reg, v, rm_prev);
else {
auto a = getGAMAddress(dst_mode, dst_reg, wm_word);
set_flags = a.addr.value() != ADDR_PSW;
if (a.addr.value() >= 0160000)
b->write(a.addr.value(), wm_word, v, true); // put in '13/12' address space
b->write(a.addr.value(), wm_word, v, rm_prev); // put in '13/12' address space
else {
int run_mode = (getPSW() >> 12) & 3;
auto phys = b->calculate_physical_address(run_mode, a.addr.value());
@ -1291,7 +1291,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
if (word_mode == wm_byte) { // MTPS
#if 0 // not in the PDP-11/70
psw &= 0xff00; // only alter lower 8 bits
psw |= getGAM(dst_mode, dst_reg, word_mode, false).value.value() & 0xef; // can't change bit 4
psw |= getGAM(dst_mode, dst_reg, word_mode, rm_cur).value.value() & 0xef; // can't change bit 4
#else
trap(010);
#endif
@ -1308,7 +1308,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
case 0b000110111: { // MFPS (get PSW to something) / SXT
if (word_mode == wm_byte) { // MFPS
#if 0 // not in the PDP-11/70
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, false);
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
uint16_t temp = psw & 0xff;
bool extend_b7 = psw & 128;
@ -1328,7 +1328,7 @@ bool cpu::single_operand_instructions(const uint16_t instr)
#endif
}
else { // SXT
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, false);
auto g_dst = getGAM(dst_mode, dst_reg, word_mode, rm_cur);
int32_t vl = -getPSW_n();
@ -1420,7 +1420,7 @@ bool cpu::conditional_branch_instructions(const uint16_t instr)
}
if (take)
addRegister(7, false, offset * 2);
addRegister(7, rm_cur, offset * 2);
return true;
}
@ -1469,7 +1469,7 @@ void cpu::pushStack(const uint16_t v)
trap(123, 7); // TODO
}
else {
uint16_t a = addRegister(6, false, -2);
uint16_t a = addRegister(6, rm_cur, -2);
b->writeWord(a, v, d_space);
}
@ -1480,7 +1480,7 @@ uint16_t cpu::popStack()
uint16_t a = getRegister(6);
uint16_t temp = b->readWord(a, d_space);
addRegister(6, false, 2);
addRegister(6, rm_cur, 2);
return temp;
}
@ -2169,7 +2169,7 @@ void cpu::step_b()
uint16_t instr = b->readWord(temp_pc);
addRegister(7, false, 2);
addRegister(7, rm_cur, 2);
if (double_operand_instructions(instr))
return;

10
cpu.h
View file

@ -14,7 +14,7 @@
typedef struct {
word_mode_t word_mode;
bool prev_mode;
rm_selection_t mode_selection;
d_i_space_t space;
std::optional<uint16_t> addr;
@ -49,12 +49,12 @@ private:
bool check_queued_interrupts();
uint16_t addRegister(const int nr, const bool prev_mode, const uint16_t value);
uint16_t addRegister(const int nr, const rm_selection_t mode_selection, const uint16_t value);
void addToMMR1(const uint8_t mode, const uint8_t reg, const word_mode_t word_mode);
gam_rc_t getGAM(const uint8_t mode, const uint8_t reg, const word_mode_t word_mode, const bool prev_mode, const bool read_value = true);
gam_rc_t getGAM(const uint8_t mode, const uint8_t reg, const word_mode_t word_mode, const rm_selection_t mode_selection, const bool read_value = true);
gam_rc_t getGAMAddress(const uint8_t mode, const int reg, const word_mode_t word_mode);
bool putGAM(const gam_rc_t & g, const uint16_t value); // returns false when flag registers should not be updated
@ -129,14 +129,14 @@ public:
uint16_t getStackPointer(const int which) const { assert(which >= 0 && which < 4); return sp[which]; }
uint16_t getPC() const { return pc; }
void setRegister(const int nr, const uint16_t value, const bool prev_mode = false);
void setRegister(const int nr, const uint16_t value, const rm_selection_t mode_selection = rm_cur);
void setRegisterLowByte(const int nr, const word_mode_t word_mode, const uint16_t value);
void setStackPointer(const int which, const uint16_t value) { assert(which >= 0 && which < 4); sp[which] = value; }
void setPC(const uint16_t value) { pc = value; }
uint16_t getRegister(const int nr, const bool sp_prev_mode = false) const;
uint16_t getRegister(const int nr, const rm_selection_t mode_selection = rm_cur) const;
bool put_result(const gam_rc_t & g, const uint16_t value);
};

8
debugger.cpp
View file

@ -114,8 +114,8 @@ void dump_par_pdr(console *const cnsl, bus *const b, const uint16_t pdrs, const
cnsl->put_string_lf(" PAR PDR");
for(int i=0; i<8; i++) {
uint16_t par_value = b->read(pars + i * 2, wm_word, false, true);
uint16_t pdr_value = b->read(pdrs + i * 2, wm_word, false, true);
uint16_t par_value = b->read(pars + i * 2, wm_word, rm_cur, true);
uint16_t pdr_value = b->read(pdrs + i * 2, wm_word, rm_cur, true);
uint16_t pdr_len = (((pdr_value >> 8) & 127) + 1) * 64;
@ -320,9 +320,9 @@ void debugger(console *const cnsl, bus *const b, std::atomic_uint32_t *const sto
for(int i=0; i<n; i++) {
if (!word)
val = b->read(addr + i, wm_byte, false, true);
val = b->read(addr + i, wm_byte, rm_cur, true);
else if (word)
val = b->read(addr + i, wm_word, false, true);
val = b->read(addr + i, wm_word, rm_cur, true);
if (val == -1) {
cnsl->put_string_lf(format("Can't read from %06o\n", addr + i));